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Major Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Revenues	$ 74,655,000	$ 64,676,000	$ 228,168,000	$ 196,324,000
Navistar [Member]
Revenue, Major Customer [Line Items]
Revenues	15,260,000	15,154,000	47,338,000	38,982,000
Volvo [Member]
Revenue, Major Customer [Line Items]
Revenues	11,178,000	11,048,000	40,413,000	33,276,000
Paccar [Member]
Revenue, Major Customer [Line Items]
Revenues	11,697,000	11,005,000	37,104,000	32,368,000
UFP [Member]
Revenue, Major Customer [Line Items]
Revenues	6,751,000	7,452,000	22,076,000	21,501,000
Revenue from Contract with Customer, Including Assessed Tax	6,751,000		22,076,000
Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	29,769,000	20,017,000	81,237,000	70,197,000
Product [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	67,511,000	62,305,000	214,403,000	187,243,000
Product [Member] | Navistar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	15,115,000	14,123,000	46,411,000	37,939,000
Product [Member] | Volvo [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	11,117,000	11,037,000	40,213,000	33,222,000
Product [Member] | Paccar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	11,532,000	10,684,000	35,779,000	25,984,000
Product [Member] | UFP [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		7,212,000		21,261,000
Product [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	22,996,000	19,249,000	69,924,000	68,837,000
Service [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	7,144,000	2,371,000	13,765,000	9,081,000
Service [Member] | Navistar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	145,000	1,031,000	927,000	1,043,000
Service [Member] | Volvo [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	61,000	11,000	200,000	54,000
Service [Member] | Paccar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	165,000	321,000	1,325,000	6,384,000
Service [Member] | UFP [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	240,000	0	240,000
Service [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 6,773,000	$ 768,000	$ 11,313,000	$ 1,360,000

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